Merge pull request #30665 from h4ghhh/etcd_client_cert_zh

[zh] Fix the etcd client certs

Author: k8s-ci-robot

content/zh/docs/tasks/administer-cluster/configure-upgrade-etcd.md

@@ -236,8 +236,8 @@ communication:
 
 ```
 ETCDCTL_API=3 etcdctl --endpoints 10.2.0.9:2379 \
-  --cert=/etc/kubernetes/pki/etcd/server.crt \
-  --key=/etc/kubernetes/pki/etcd/server.key \
+  --cert=/etc/kubernetes/pki/etcd/client.crt \
+  --key=/etc/kubernetes/pki/etcd/client.key \
   --cacert=/etc/kubernetes/pki/etcd/ca.crt \
   member list
 ```
@@ -253,8 +253,8 @@ ETCDCTL_API=3 etcdctl --endpoints 10.2.0.9:2379 \
 
 ```
 ETCDCTL_API=3 etcdctl --endpoints 10.2.0.9:2379 \
-  --cert=/etc/kubernetes/pki/etcd/server.crt \
-  --key=/etc/kubernetes/pki/etcd/server.key \
+  --cert=/etc/kubernetes/pki/etcd/client.crt \
+  --key=/etc/kubernetes/pki/etcd/client.key \
   --cacert=/etc/kubernetes/pki/etcd/ca.crt \
   member list
 ```